Strain-insulator.



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STRAIN INSULATOR. APPLICATION FILE'D JUNE 28.19I7.

Patented Nov. 13, 1917.

2 SHEETS-SHEET I.

' B. A. PLIMPTON.

STRAIN xNsuLAToR.

ATI

` APPL C 1917. v1,246,461 Patented Nov. 13, 1917.

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.is turned upon the insulator section, the

' locking ring 13 is also turned. In assemblin the parts, the cap isplaced over the insu ator section with the locking ring 13 positionedthereon. Having rst spread the ends of the shoulder 7 of t e lockingmember v5, upon moving the cap downwardly upon the insulator section andthen turning it to the right, the parts initially take the positionshown in Fig. 5, where the ring 13 has just entered under the shoulder7. Additional relative turning of the insulator section and cap carriesthe locking ring 13 farther under the shoulder 7 until it reaches theposition shown in Fig. 6 where the ring 13 is almost entirely engagedwith the shoulder. A. very slight- J.urther turning movement, after theparts are positioned, as in Fig. 6, brings the two locking rings intocoincident position, with the ring 13 underneath the flan e 7, as shownin Figs. 1 and 3. Upon re easing the ends of the locking ring 5, thespring action of the latter returns them to the normal positionillustrated in Figs. 1, 3 and 7. The flange 7 is substantiallycontinuous and adords practically a continuous engaging `surface forholding the locking ring 13, which cannot be removed .withoutconsiderable diiiiculty, after it is once locked in place.

I claim as my invention:

1. The combination with an insulator section having a separable lockingmember thereon embodying a locking shoulder, of a cap coperating withthe insulator section and carrying a locking device thatv is broughtinto engagement with said shoulder by being threaded on the insulatorsection.`

2. The combination with an insulator secjtion having a metallic lockingmember thereon embodying a locking shoulder, of a capcoperating with theinsulator section and carrying a locking device that is brought intoengagement with said shoulder by being threaded on the insulatorsection.

3. The combination with an insulator sectionhaving a separable splitlocking meinlator section and carrying a locking device' that is broughtinto engagement with said shoulder by being threaded on the insulatorsection.

5. The combination with an insulatorsec-` tion having a separable splitlocking member thereon including a shoulder which is substantiallycontinuous when in normal locking position, the ends of which shouldercan be spread to forni a thread, of a cap cooperating with the insulatorsection and carrying a locking device in the form of a split ring thatis brought into engagement with said shoulder by threading it thereonwhen the ends are spread.

6. The combination with an insulator section having a reduced portionaffording a shoulder, of a split locking member arranged ,in saidreduced portion normally resting against said shoulder and itselfprovided with a substantially continuous shoulder, the ends of which canbe spread to form a thread, of a cap cooperating lwith the insulatorsection and carrying a locking device in the form of a split ring thatis brought into engagement with said continuous shoulder by threading itthereonwhen the ends are spread.

7. The combination with an insulator sec tion, of a cap, and lockingmeans, ior holding the cap on said insulator section coin- Erisingcoperating split rings, one carried y the insulator section and theother by the cap, the ends of which rings are separable by spreading toafford threads whereby the cap may be threaded on the insulator section.

BENTLEY A. PLIMPTON.

